Characteristics of New Two-Dimensional Seismic Reflection Profiles in Qiangtang Basin, Northern Tibet
详细信息
- 责任者：Li Zhongxiong (Chengdu Center of Geological Survey ; China Geological Survey ; Chengdu 610081 ; China) ; Qiu Haijun
- 刊名：Acta Geoscientica Sinica
- 出版年：2013
- 卷期：34(4)
- 关键词：地震勘探 ; seismic exploration ; 数据处理 ; data processing ; 羌塘盆地 ; Qiangtang Basin
- 页码：p.477-484
- 图表：6 illus., 1 table, 26 refs.
- 分类号：1600
- issnNo：ISSN1006-3021
- isbnNo：CN11-3474/P
摘要
It is difficult to acquire high-quality seismic sections in Qiangtang basin because of its complex seismic geological condition and low signal-noise ratio.In order to find out suitable technique for this basin,the authors conducted tests along a seismic profile more than several hundred kilometers long on the basis of increasing signal-noise ratio.The results indicate that a single hole with the depth of at least 18 meters,16～20 kilogram charge sizes,20～40 meters trace group interval,more than 120 folds and "X" type geophone array map constitute the optimum shooting and receiving parameters suitable for the feature of Qiangtang basin.And the quality of 2D seismic profiles obtained by using these parameters and techniques can be increased greatly and is obviously superior to that of the profiles obtained in the past.The processed stacking profiles show informative reflection and reveal the features of spatial distribution of Palaeozoic basement,Triassic,middle-upper Jurassic,upper Jurassic strata and faults,thus providing high-quality data for ascertaining the layer thickness and the structural traps and boundaries.In addition,the processed stacking profile across the central uplifting belt clearly shows that this uplifting belt is an anticline structure formed recently instead of an ancient dome.
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